145441021 has 4 divisors (see below), whose sum is σ = 158662944. Its totient is φ = 132219100.

The previous prime is 145440979. The next prime is 145441031. The reversal of 145441021 is 120144541.

145441021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 120144541 = 11 ⋅10922231.

It is a cyclic number.

It is not a de Polignac number, because 145441021 - 2⁹ = 145440509 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 145440983 and 145441001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145441031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6610945 + ... + 6610966.

It is an arithmetic number, because the mean of its divisors is an integer number (39665736).

Almost surely, 2^145441021 is an apocalyptic number.

145441021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

145441021 is a deficient number, since it is larger than the sum of its proper divisors (13221923).

145441021 is a wasteful number, since it uses less digits than its factorization.

145441021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13221922.

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 145441021 is about 12059.8930758112. The cubic root of 145441021 is about 525.8908786346.

Adding to 145441021 its reverse (120144541), we get a palindrome (265585562).

The spelling of 145441021 in words is "one hundred forty-five million, four hundred forty-one thousand, twenty-one".